Symphony Sid was a radio disc jockey known as “The Dean of Jazz Radio.” He helped Charlie Parker and many other musicians gain widespread recognition by promoting their work on the air. While he was best known for his radio show on WMCA in New York, his career spanned several decades and stations. Here you can hear him do a commercial break on WMCA http://www.youtube.com/watch?v=tPGkpOz3yb0.